Maximizing Intellisense for custom Javascript services in VS Code using Typescript definitions

While developing a backend server with SailsJS, I encountered an issue where my model helper services and own services were not showing Intellisense. To address this, I set up typings, installed type definitions for lodash and node globally, and created jsconfig.json and tsconfig.json files.

In an attempt to create definitions for my services, I made an index.d.ts file in a directory within typings/global. The content included function declarations and variable definitions to test the effectiveness of these custom definitions.

Despite adding a reference tag to include the index.d.ts file in typings/index.d.ts, I was unable to see any sensible Intellisense when typing foo. or baz. in my project's Javascript files.

The only way I could achieve some level of Intellisense support was by importing the services in each file using import or require statements. However, this method did not utilize Typescript's definition files, resulting in an undesired outcome.

I questioned why the type definitions for node and lodash worked seamlessly in Javascript while mine did not. It left me wondering how to correctly implement Intellisense for my custom services.

Answer №1

In order to replicate the mentioned issue, I need to exclude the "allowJs": "true" option from the tsconfig.json file. If you want both your TypeScript and JavaScript files to be recognized as part of a single project, it's essential to have a tsconfig.json file with the "allowJs": "true" setting enabled and no jsconfig.json present.

Answer №2

No need to specifically include typings/index.d.ts for your project setup. The simplest approach is to create a global declaration file and add your declarations there.

Instead of using var and namespace, opt for interface instead.

For example, you can easily place the following code in the root directory:

// custom.d.ts
interface Car {
  drive: () => void
}

interface Bike { speed: number }

Answer №3

Encountering the same issue, I encountered a solution by realizing that the editor (Sublime Text) was searching in the wrong folder for the file. The problem was resolved by using relative referencing to point to the correct path. In my case, the specific path differed, but in this instance it was:

/// <reference path="../../typings/index.d.ts" />

The file index.d.ts includes the following references:

/// <reference path="globals/core-js/index.d.ts" />
/// <reference path="globals/jasmine/index.d.ts" />
/// <reference path="globals/node/index.d.ts" />

My directory and file structure is displayed as shown below:

https://i.sstatic.net/3uugV.jpg

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